While it's not a video game crossover, it looks like Archie Comics, who owns the licenses to produce comics for both Sonic the Hedgehog and Mega Man (or Rockman, if you prefer), is planning a 12-issue storyline where two of gaming's biggest heroes will meet. The details are largely under wraps, but looks like things will be getting interesting for the Sonic and Mega Man comic lines (the latter began publication in 2011) in the next year or so. According to SEGA's official blog, the storyline will run through the three current on-going series: Sonic the Hedgehog, Sonic Universe and Mega Man.
I'm personally looking forward to this, especially with writer Ian Flynn (who writes for both Sonic and Mega Man) at the reins, the crossover should be in good hands. No news on who is doing interior artwork yet, but Archie Sonic artist staple and the penciler for the first four issues of Archie's Mega Man series, Patrick Spaziante (a.k.a. Spaz) will be doing the cover art. We can probably expect the usual Archie talent: Tracey Yardley, Ben Bates, Chad Tomas on pencils (among so many others), Terry Austin, Jim Amash. Rick Bryant on inks, Matt Herms on colors, etc.. This, of course, is just speculation, but all these artists are currently involved with at least one of the above three series in those same roles, so it's not really a stretch to expect them to be part of this project. Time will tell though.
Editor Paul Kaminski had this to say about the upcoming crossover event:
“We’ve been gearing up for this for years,” said Kaminski. “From the moment we had Mega Man at Archie, we knew we wanted to bring Sonic and the Blue Bomber together. It’s a big budget movie featuring two of the most storied video game franchises. This has never happened before. We’re making history here, and it’s going to knock people for a loop. This is what comics are all about – drama, fun, action and tons of surprises. Fans will not be disappointed.”
SEGA has posted a teaser image on their blog, featuring Mega Man's helmet and Sonic's shoes.
Get hyped people.